弦现在是金属的，但在十六、十七、到十八世纪，它们是用猫肠或羊肠制作的。

The strings are now metallic, but in the sixteenth, seventeenth to eighteenth century, they would have been made out of cat or sheep gut.

在人生道路上，走上坡路要昂首阔步，走下坡路要谨小慎微，走阳关道要目视前方，走羊肠路要俯视脚下。

The road in life, uphill to swagger, downhill to be timid and overcautious, way to go straight ahead, take a road to overlooking the foot.